Sheet Metal Structures Flashcards
7 cards from real Airframe Mechanic Certification practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Sheet Metal Structures flashcards as text
What is the minimum edge distance for a rivet hole measured from the center of the hole to the edge of the sheet?
Answer: 1.5 times the rivet diameter
The minimum edge distance is 1.5 times the rivet diameter to prevent sheet tearing and ensure structural integrity.
When forming a bend in sheet metal, the bend allowance refers to:
Answer: The arc length of material consumed in the curved portion of the bend
Bend allowance is the arc length of material that forms the curved section of the bend, used to calculate flat pattern dimensions.
Which type of corrosion appears as white or gray powdery deposits on aluminum sheet metal?
Answer: Surface (uniform) corrosion
Surface or uniform corrosion on aluminum produces a white or gray powdery aluminum oxide deposit on the surface.
A 'joggle' in aircraft sheet metal is used to:
Answer: Allow one sheet to overlap another while maintaining a flush surface
A joggle is an offset bend that allows overlapping sheets to remain flush with each other and the surrounding structure.
What is the purpose of using a dimpling operation instead of countersinking on thin sheet metal?
Answer: Thin sheet does not have enough material depth for a full countersink without knife-edge
On thin sheets, countersinking can leave a knife-edge around the hole, so dimpling displaces material rather than removing it.
The term 'setback' in sheet metal layout refers to:
Answer: The distance from the outside mold line to the bend tangent line
Setback is the distance from the outside mold line (OML) to the bend tangent line, used to locate bend lines on the flat blank.
What does 'grain direction' mean when working with aircraft sheet metal?
Answer: The direction the metal crystals were aligned during rolling
Grain direction refers to the alignment of metal crystals caused by the rolling process, affecting strength and bend characteristics.